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Q/BQB 494-2021 English PDF (QBQB494-2021)

Q/BQB 494-2021 English PDF (QBQB494-2021)

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Q/BQB 494-2021: Cold-rolled steel strip for welded pipe use

BaoSteel: Cold-rolled steel strip for welded pipe use
Q/BQB 494-2021
BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD
Replacing Q/BQB 494-2018
Cold-Rolled Steel Strip for Welded Pipe Use
ISSUED ON: JUNE 04, 2021
IMPLEMENTED ON: AUGUST 10, 2021
Issued by: Baoshan Iron and Steel Co., Ltd.
Table of Contents
Foreword ... 3
1 Chemical composition ... 4
2 Mechanical properties ... 4
3 Inspection and test ... 4
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for Standardization ?€? Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This Document Replaced Q/BQB 494-2018 Cold-Rolled Steel Strip for Welded Pipe Use.
Compared with Q/BQB 494-2018, this Document has the major technical changes as follows:
--- Cancel the provisions of N component of BHG1-A designation;
--- Adjust the lower limit of C component of BHG2 from 0.02 to 0.015;
--- Adjust the lower limit of Alt of BHG2 from 0.020 to 0.015;
--- Adjust the upper limit of the yield strength of BHG2 from 260MPa to 280MPa; --- Adjust the upper limit of roughness of BHG2 from 1.0??m to 1.3??m;
--- Make editorial modification.
Please note some contents of this Document may involve patents. The issuing agency of this Document does not assume the responsibility to identify these patents. This Document was proposed by Manufacturing and Management Department of the Baoshan Iron and Steel Co., Ltd.
This Document shall be under the jurisdiction of Manufacturing and Management Department of the Baoshan Iron and Steel Co., Ltd.
Drafting organization of this Document: Manufacturing and Management Department of the Baoshan Iron and Steel Co., Ltd.
Chief drafting staffs of this Document: Yuan Min.
The historical editions replaced by this Document are as follows:
Q/BQB 494-2009, Q/BQB 494-2014, Q/BQB 494-2018.

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